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It depends on your tank size, and how patient you are at waiting for it to grow. You should see around 0.25-0.5" per month on the RTM, whereas the grammode may only grow 1" in a year. Both fish like to hide when there are no dithers present.

That sucks they like to hide... is that a phase they go through as juvis? Would seem like a waste for either big bad fish like that to be shy. I have a salvini that likes his cave but he is out about 50% of the time or more

Hornet tilapia are very intelligent and quite large. I have seen a 26inch speciman at Cichlid world in Garden City, Michigan. They are a very commonly available cichlid, compared to the tiger mota and grammodes. I always wanted a red tiger,with a group of yellow labridens.